Nassau County police are looking for the man responsible for robbing a woman outside an Elmont cellphone store Friday night.

Police said the suspect approached the 25-year-old victim at 7:40 p.m. as she was leaving the Metro PCS store at 1789 Dutch Broadway, threatening her with a knife, saying "I have a knife, if you don't give me your bag, I'll stab you."

The suspect grabbed her pocketbook and after a brief struggle, removed it from her shoulder.

The victim followed the suspect and told police he was last seen running though the rear yards on Rifton Street.

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The suspect was described as being about 5-foot-5, in his 20s, with a thin build and wearing dark jeans, a black sweater, a black hood and a dark knit hat with a white scarf across his face, police said.

The victim refused medical attention at the scene.

Detectives ask anyone with information about the robbery to call Crime Stoppers at 800-244-TIPS. All callers will remain anonymous.